I don't believe there are specific words for any of your 3 questions.
1.a) A device not equipped with wifi connection out-of-the-box might be described as Not wiFi enabled but your idea of dumb is just as good. If the user has tampered with it then it is WiFi disabled.
1.b) I suppose it depends upon the reason why a person disables the WiFi. It might be because they want to repurpose the device, improve the security, have no need for the feature or are just plain paranoid! Whichever it is there is no specific word(s) that spring to mind.
1.c) I'm not quite sure what you mean by this. But disabling the WiFi is just about all you can say.
You might use words such as "tinkering" or "tampering" in some circumstances,but they don't cover all situations.

I don't believe there are specific words for any of your 3 questions.
1.a) A device not equipped with wifi connection out-of-the-box might be described as Not wiFi enabled but your idea of dumb is just as good. If the user has tampered with it then it is WiFi disabled.
1.b) I suppose it depends upon the reason why a person disables the WiFi. It might be because they want to repurpose the device, improve the security, have no need for the feature or are just plain paranoid! Whichever it is there is no specific word(s) that spring to mind.
1.c) I'm not quite sure what you mean by this. But disabling the WiFi is just about all you can say.
You might use words such as "tinkering", "tampering" or "hacking" in some circumstances,but they don't cover all situations.